Re: [v10 01/12] drm: Add HDR source metadata property

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On 2019-05-15 21:45, Ville Syrjälä wrote:
> On Wed, May 15, 2019 at 07:33:10PM +0000, Jonas Karlman wrote:
>> On 2019-05-15 21:10, Ville Syrjälä wrote:
>>> On Tue, May 14, 2019 at 11:06:23PM +0530, Uma Shankar wrote:
>>>> This patch adds a blob property to get HDR metadata
>>>> information from userspace. This will be send as part
>>>> of AVI Infoframe to panel.
>>>>
>>>> It also implements get() and set() functions for HDR output
>>>> metadata property.The blob data is received from userspace and
>>>> saved in connector state, the same is returned as blob in get
>>>> property call to userspace.
>>>>
>>>> v2: Rebase and modified the metadata structure elements
>>>> as per Ville's POC changes.
>>>>
>>>> v3: No Change
>>>>
>>>> v4: Addressed Shashank's review comments
>>>>
>>>> v5: Rebase.
>>>>
>>>> v6: Addressed Brian Starkey's review comments, defined
>>>> new structure with header for dynamic metadata scalability.
>>>> Merge get/set property functions for metadata in this patch.
>>>>
>>>> v7: Addressed Jonas Karlman review comments and defined separate
>>>> structure for infoframe to better align with CTA 861.G spec. Added
>>>> Shashank's RB.
>>>>
>>>> v8: Addressed Ville's review comments. Moved sink metadata structure
>>>> out of uapi headers as suggested by Jonas Karlman.
>>>>
>>>> v9: Rebase and addressed Jonas Karlman review comments.
>>>>
>>>> Signed-off-by: Uma Shankar <uma.shankar@xxxxxxxxx>
>>>> Reviewed-by: Shashank Sharma <shashank.sharma@xxxxxxxxx>
>>>> ---
>>>>  drivers/gpu/drm/drm_atomic.c      |  2 ++
>>>>  drivers/gpu/drm/drm_atomic_uapi.c | 13 +++++++++++++
>>>>  drivers/gpu/drm/drm_connector.c   |  6 ++++++
>>>>  include/drm/drm_connector.h       | 11 +++++++++++
>>>>  include/drm/drm_mode_config.h     |  7 +++++++
>>>>  include/linux/hdmi.h              | 26 ++++++++++++++++++++++++++
>>>>  include/uapi/drm/drm_mode.h       | 23 +++++++++++++++++++++++
>>>>  7 files changed, 88 insertions(+)
>>>>
>>>> diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
>>>> index f4924cb..0d27195 100644
>>>> --- a/drivers/gpu/drm/drm_atomic.c
>>>> +++ b/drivers/gpu/drm/drm_atomic.c
>>>> @@ -925,6 +925,8 @@ static void drm_atomic_connector_print_state(struct drm_printer *p,
>>>>  
>>>>  	drm_printf(p, "connector[%u]: %s\n", connector->base.id, connector->name);
>>>>  	drm_printf(p, "\tcrtc=%s\n", state->crtc ? state->crtc->name : "(null)");
>>>> +	drm_printf(p, "\thdr_metadata_changed=%d\n",
>>>> +		   state->hdr_metadata_changed);
>>>>  
>>>>  	if (connector->connector_type == DRM_MODE_CONNECTOR_WRITEBACK)
>>>>  		if (state->writeback_job && state->writeback_job->fb)
>>>> diff --git a/drivers/gpu/drm/drm_atomic_uapi.c b/drivers/gpu/drm/drm_atomic_uapi.c
>>>> index 4131e66..4aa82c91 100644
>>>> --- a/drivers/gpu/drm/drm_atomic_uapi.c
>>>> +++ b/drivers/gpu/drm/drm_atomic_uapi.c
>>>> @@ -676,6 +676,8 @@ static int drm_atomic_connector_set_property(struct drm_connector *connector,
>>>>  {
>>>>  	struct drm_device *dev = connector->dev;
>>>>  	struct drm_mode_config *config = &dev->mode_config;
>>>> +	bool replaced = false;
>>>> +	int ret;
>>>>  
>>>>  	if (property == config->prop_crtc_id) {
>>>>  		struct drm_crtc *crtc = drm_crtc_find(dev, file_priv, val);
>>>> @@ -726,6 +728,14 @@ static int drm_atomic_connector_set_property(struct drm_connector *connector,
>>>>  		 */
>>>>  		if (state->link_status != DRM_LINK_STATUS_GOOD)
>>>>  			state->link_status = val;
>>>> +	} else if (property == config->hdr_output_metadata_property) {
>>>> +		ret = drm_atomic_replace_property_blob_from_id(dev,
>>>> +				&state->hdr_output_metadata,
>>>> +				val,
>>>> +				-1, sizeof(struct hdr_output_metadata),
>>> Those function arguments are nonsesne for a blob that isn't an array.
>>>
>>>> +				&replaced);
>>>> +		state->hdr_metadata_changed |= replaced;
>>>> +		return ret;
>>>>  	} else if (property == config->aspect_ratio_property) {
>>>>  		state->picture_aspect_ratio = val;
>>>>  	} else if (property == config->content_type_property) {
>>>> @@ -814,6 +824,9 @@ static int drm_atomic_connector_set_property(struct drm_connector *connector,
>>>>  		*val = state->colorspace;
>>>>  	} else if (property == connector->scaling_mode_property) {
>>>>  		*val = state->scaling_mode;
>>>> +	} else if (property == config->hdr_output_metadata_property) {
>>>> +		*val = state->hdr_output_metadata ?
>>>> +			state->hdr_output_metadata->base.id : 0;
>>>>  	} else if (property == config->content_protection_property) {
>>>>  		*val = state->content_protection;
>>>>  	} else if (property == config->writeback_fb_id_property) {
>>>> diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
>>>> index 11fcd25..c9ac8b9 100644
>>>> --- a/drivers/gpu/drm/drm_connector.c
>>>> +++ b/drivers/gpu/drm/drm_connector.c
>>>> @@ -1051,6 +1051,12 @@ int drm_connector_create_standard_properties(struct drm_device *dev)
>>>>  		return -ENOMEM;
>>>>  	dev->mode_config.non_desktop_property = prop;
>>>>  
>>>> +	prop = drm_property_create(dev, DRM_MODE_PROP_BLOB,
>>>> +				   "HDR_OUTPUT_METADATA", 0);
>>>> +	if (!prop)
>>>> +		return -ENOMEM;
>>>> +	dev->mode_config.hdr_output_metadata_property = prop;
>>>> +
>>>>  	return 0;
>>>>  }
>>>>  
>>>> diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
>>>> index e257b87..54daa54 100644
>>>> --- a/include/drm/drm_connector.h
>>>> +++ b/include/drm/drm_connector.h
>>>> @@ -603,6 +603,13 @@ struct drm_connector_state {
>>>>  	 * and the connector bpc limitations obtained from edid.
>>>>  	 */
>>>>  	u8 max_bpc;
>>>> +
>>>> +	/**
>>>> +	 * @hdr_output_metadata:
>>>> +	 * DRM blob property for HDR output metadata
>>>> +	 */
>>>> +	struct drm_property_blob *hdr_output_metadata;
>>>> +	u8 hdr_metadata_changed : 1;
>>> I think the changed flag is now unused. Should be dropped if so.
>> I am using this changed flag in my dw-hdmi HDR patch [1] to force set mode_changed.
>>
>> if (new_state->hdr_metadata_changed)
>>     crtc_state->mode_changed = true;
>>
>> Maybe this is bad practice and should be handled in some other way?
> Could just check old metadata != new metadata. The i915 patch even
> memcmp()s the thing, but I think that's probably overdoing it since
> we anyway downgrade the modeset to a fastset whenever possible.
>
> The core doesn't memcmp() either IIRC, so hdr_metadata_changed should
> be equal to just comparing the old and new blob pointers.

Thanks for the pointers, I will probably end up following what the i915 code does once it is fully ready.

Regards,
Jonas

>
>> [1] https://github.com/Kwiboo/linux-rockchip/commit/a9ccea6d3d51001f6b4ab9a1fb600a38e517b9ce
>>
>> Regards,
>> Jonas
>>>>  };
>>>>  
>>>>  /**
>>>> @@ -1237,6 +1244,10 @@ struct drm_connector {
>>>>  	 * &drm_mode_config.connector_free_work.
>>>>  	 */
>>>>  	struct llist_node free_node;
>>>> +
>>>> +	/* HDR metdata */
>>>> +	struct hdr_output_metadata hdr_output_metadata;
>>>> +	struct hdr_sink_metadata hdr_sink_metadata;
>>>>  };
>>>>  
>>>>  #define obj_to_connector(x) container_of(x, struct drm_connector, base)
>>>> diff --git a/include/drm/drm_mode_config.h b/include/drm/drm_mode_config.h
>>>> index 5764ee3..58278cc 100644
>>>> --- a/include/drm/drm_mode_config.h
>>>> +++ b/include/drm/drm_mode_config.h
>>>> @@ -842,6 +842,13 @@ struct drm_mode_config {
>>>>  	 */
>>>>  	struct drm_property *content_protection_property;
>>>>  
>>>> +	/**
>>>> +	 * hdr_output_metadata_property: Connector property containing hdr
>>>> +	 * metatda. This will be provided by userspace compositors based
>>>> +	 * on HDR content
>>>> +	 */
>>>> +	struct drm_property *hdr_output_metadata_property;
>>>> +
>>>>  	/* dumb ioctl parameters */
>>>>  	uint32_t preferred_depth, prefer_shadow;
>>>>  
>>>> diff --git a/include/linux/hdmi.h b/include/linux/hdmi.h
>>>> index 927ad64..6780476 100644
>>>> --- a/include/linux/hdmi.h
>>>> +++ b/include/linux/hdmi.h
>>>> @@ -152,6 +152,16 @@ enum hdmi_content_type {
>>>>  	HDMI_CONTENT_TYPE_GAME,
>>>>  };
>>>>  
>>>> +enum hdmi_metadata_type {
>>>> +	HDMI_STATIC_METADATA_TYPE1 = 1,
>>>> +};
>>>> +
>>>> +enum hdmi_eotf {
>>>> +	HDMI_EOTF_TRADITIONAL_GAMMA_SDR,
>>>> +	HDMI_EOTF_TRADITIONAL_GAMMA_HDR,
>>>> +	HDMI_EOTF_SMPTE_ST2084,
>>>> +};
>>>> +
>>>>  struct hdmi_avi_infoframe {
>>>>  	enum hdmi_infoframe_type type;
>>>>  	unsigned char version;
>>>> @@ -320,6 +330,22 @@ struct hdmi_vendor_infoframe {
>>>>  	unsigned int s3d_ext_data;
>>>>  };
>>>>  
>>>> +/* HDR Metadata as per 861.G spec */
>>>> +struct hdr_static_metadata {
>>>> +	__u8 eotf;
>>>> +	__u8 metadata_type;
>>>> +	__u16 max_cll;
>>>> +	__u16 max_fall;
>>>> +	__u16 min_cll;
>>>> +};
>>>> +
>>>> +struct hdr_sink_metadata {
>>>> +	__u32 metadata_type;
>>>> +	union {
>>>> +		struct hdr_static_metadata hdmi_type1;
>>>> +	};
>>>> +};
>>>> +
>>>>  int hdmi_vendor_infoframe_init(struct hdmi_vendor_infoframe *frame);
>>>>  ssize_t hdmi_vendor_infoframe_pack(struct hdmi_vendor_infoframe *frame,
>>>>  				   void *buffer, size_t size);
>>>> diff --git a/include/uapi/drm/drm_mode.h b/include/uapi/drm/drm_mode.h
>>>> index 83cd163..997a7e0 100644
>>>> --- a/include/uapi/drm/drm_mode.h
>>>> +++ b/include/uapi/drm/drm_mode.h
>>>> @@ -630,6 +630,29 @@ struct drm_color_lut {
>>>>  	__u16 reserved;
>>>>  };
>>>>  
>>>> +/* HDR Metadata Infoframe as per 861.G spec */
>>>> +struct hdr_metadata_infoframe {
>>>> +	__u8 eotf;
>>>> +	__u8 metadata_type;
>>>> +	struct {
>>>> +		__u16 x, y;
>>>> +		} display_primaries[3];
>>>> +	struct {
>>>> +		__u16 x, y;
>>>> +		} white_point;
>>>> +	__u16 max_display_mastering_luminance;
>>>> +	__u16 min_display_mastering_luminance;
>>>> +	__u16 max_cll;
>>>> +	__u16 max_fall;
>>>> +};
>>>> +
>>>> +struct hdr_output_metadata {
>>>> +	__u32 metadata_type;
>>>> +	union {
>>>> +		struct hdr_metadata_infoframe hdmi_metadata_type1;
>>>> +	};
>>>> +};
>>>> +
>>>>  #define DRM_MODE_PAGE_FLIP_EVENT 0x01
>>>>  #define DRM_MODE_PAGE_FLIP_ASYNC 0x02
>>>>  #define DRM_MODE_PAGE_FLIP_TARGET_ABSOLUTE 0x4
>>>> -- 
>>>> 1.9.1

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